Re: Parts of a list
- To: mathgroup at smc.vnet.net
- Subject: [mg15460] Re: Parts of a list
- From: Fabien Boniver <F.Boniver at ulg.ac.be>
- Date: Mon, 18 Jan 1999 04:22:02 -0500
- Organization: Universite de Liege
- References: <77jkve$304@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hossein Kazemi wrote:
> I have a list (matrix) that looks like this
>
> x={{1,0},{2.5, .5},{3,0},{0,2}}
>
> Now I want to eliminate those vectors that have zero for the second
> case. That is, I want to get
>
> {{2.5, .5},{0,2}}.
>
> Is there a quick way of doing this?
> I tried to apply Select to this but could not get it to work.
>
> Thanks for your help.
>
> Hossein Kazemi
> UMass
> kazemi at som.umass.edu
I propose you use the following function :
elim2nd0[list_]:=Select[list,(#[[2]]!=0)&]
which solves your problem on my machine (M 30, MacOs 8.1).
Fabien BONIVER
Institute of Mathematics, University of Liege, Belgium
f.boniver at ulg.ac.be